squito commented on issue #24239: [SPARK-27121][REPL] Resolve Scala compiler failure for Java 9+ in REPL URL: https://github.com/apache/spark/pull/24239#issuecomment-478029112 btw, how are you running tests? My approach has been to build everything with jdk8, switch to jdk11 and then run just the scalatest plugin (`build/mvn scalatest:test`). I found that if just ran `build/mvn test` with jdk11, it decided to recompile everything. I'm assuming we still want to have the binaries built using jdk8. Just setting `-target 1.8` isn't enough to ensure that the binaries are actually compatible with 1.8, so I figured that's the best way to test.
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